Looks like copied tempfile need to be flushed before further processing. This issue won't happen if the uploaded file has enough file size.
1.2 KiB
32x32px
1.2 KiB
32x32px
![](/vbatts/mastodon/raw/commit/8c8cb7f1f8de634b01211a7364e350276b93bcd9/spec/fixtures/files/mini-static.gif)